Wavelength conversion device, light source device, and projector

Abstract

To provide a wavelength conversion device, a light source device, and a projector capable of suppressing degradation of a phosphor.SOLUTION: A wavelength conversion device comprises: a phosphor irradiated with excitation light; a support substrate on which the phosphor is disposed; and a drive device which rotates the support substrate. The rotation center of the support substrate and an irradiation center being the center of an irradiation region of the excitation light on the phosphor are offset from each other. The irradiation region of the excitation light includes the rotation center. The phosphor is disposed at a position including the trajectory of the irradiation region of the excitation light on the rotated support substrate.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present disclosure relates to a wavelength conversion device, a light source device, and a projector. [Background technology]

[0002] BACKGROUND ART Conventionally, there is known a projector that modulates light emitted from a light source device to form image light and projects the formed image light (see, for example, Patent Document 1). The light source device employed in the projector described in Patent Document 1 includes a light source that emits a light beam and a fluorescent light-emitting element. The fluorescent light-emitting element is supported by a moving mechanism so as to be movable in the left-right direction relative to the housing of the light source device. The fluorescent light-emitting element has a phosphor and a phosphor support substrate that supports the phosphor. The phosphor includes phosphor particles that absorb excitation light, which is part of the light beam, and emit fluorescence. The phosphor is configured in a rectangular shape that is long along the direction of movement by the moving mechanism, and has a first portion on one end side and a second portion on the other end side. When the fluorescence light emitting element is moved to one side by the moving mechanism, the first portion is positioned on the optical axis, and when the fluorescence light emitting element is moved to the other side, the second portion is positioned on the optical axis. Therefore, for example, when a predetermined time has elapsed or when the amount of fluorescent light emitted from the fluorescent light-emitting element falls below a predetermined threshold, the portion of the fluorescent light-emitting element located on the optical axis is switched between the first portion and the second portion. As a result, the light source device described in Patent Document 1 is able to suppress a decrease in the amount of fluorescent light emitted due to deterioration of the phosphor, while extending the life of the fluorescent light-emitting element and, ultimately, the light source device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-26122 Summary of the Invention [Problem to be solved by the invention]

[0004] In the light source device described in Patent Document 1, as described above, the portion of the phosphor located on the optical axis, that is, the portion where the excitation light is incident, is switched between the first portion and the second portion. However, during the period when the phosphor does not move by the moving mechanism, the excitation light continues to be incident on the same portion of the phosphor. For this reason, there is a problem that the deterioration of the phosphor tends to progress and the amount of fluorescence emission tends to decrease. In particular, in recent years, higher output of the light source device, and thus higher brightness of the projector, have been demanded, and the amount of excitation light irradiated on the phosphor tends to increase. Therefore, a configuration that can further suppress the deterioration of the phosphor has been demanded.

Means for Solving the Problems

[0005] The wavelength conversion device according to the first aspect of the present disclosure includes a phosphor irradiated with excitation light, a support substrate on which the phosphor is disposed, and a driving device that rotates the support substrate. The center of rotation of the support substrate and the irradiation center, which is the center of the irradiation region of the excitation light on the phosphor, are displaced from each other. The irradiation region of the excitation light includes the center of rotation, and the phosphor is disposed at a position including the locus of the irradiation region of the excitation light on the support substrate that is rotated.

[0006] The wavelength conversion device according to the second aspect of the present disclosure includes a phosphor irradiated with excitation light, a support substrate on which the phosphor is disposed, and a driving device that rotates the support substrate. The peak portion where the intensity of the excitation light is maximum in the irradiation region of the excitation light is off the center of rotation of the support substrate. The irradiation region of the excitation light includes the center of rotation, and the phosphor is disposed at a position including the locus of the irradiation region of the excitation light on the support substrate that is rotated.

[0007] The light source device according to the third aspect of the present disclosure includes a light source that emits excitation light, the wavelength conversion device according to the first or second aspect, and a lens that guides the excitation light to the phosphor.

[0008] A projector according to a fourth aspect of the present disclosure includes a light source device according to the third aspect, an image forming device that modulates light emitted from the light source device to form image light, and a projection optical device that projects the formed image light. [Brief explanation of the drawings]

[0009]

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Mode for Carrying Out the Invention

[0010] [First Embodiment] Hereinafter, the first embodiment of the present disclosure will be described with reference to the drawings. [Schematic Configuration of Projector] FIG. 1 is a schematic diagram showing the configuration of the projector 1 according to the present embodiment. The projector 1 according to the present embodiment projects image light according to image information. As shown in FIG. 1, the projector 1 includes an exterior housing 11 and an image projection device 2 housed in the exterior housing 11. In addition, although not shown, the projector 1 includes a control device that controls the operation of the projector 1, a power supply device that supplies power to the electronic components of the projector 1, and a cooling device that cools the cooling target of the projector 1.

[0011] [Configuration of Image Projection Device] The image projection device 2 forms image light according to the input image information and projects the formed image light. The image projection device 2 includes a light source device 3, a homogenizing optical system 21, a color separation optical system 22, a relay optical system 23, an image forming device 24, an optical component housing 25, and a projection optical device 26.

[0012] The light source device 3 emits illumination light to the homogenizing optical system 21. The configuration of the light source device 3 will be described in detail later. The homogenizing optical system 21 homogenizes the illumination light emitted from the light source device 3. The homogenized illumination light illuminates the modulation region of a light modulation element 243, which will be described later, via a color separation optical system 22 and a relay optical system 23. The homogenizing optical system 21 includes two lens arrays 211 and 212, a polarization conversion element 213, and a superposition lens 214. The color separation optical system 22 separates the illumination light incident from the homogenizing optical system 21 into red, green, and blue color lights. The color separation optical system 22 includes two dichroic mirrors 221 and 222, and a reflection mirror 223 that reflects the blue light separated by the dichroic mirror 221.

[0013] The relay optical system 23 is provided in the optical path of the red light, which is longer than the optical paths of the other color lights, and suppresses the loss of the red light. The relay optical system 23 includes an incident-side lens 231, relay lenses 233, and reflection mirrors 232 and 234. In the present embodiment, the red light is guided to the relay optical system 23. However, the present invention is not limited to this, and for example, a color light whose optical path is longer than that of the other color lights may be used as the blue light, and the blue light may be guided to the relay optical system 23.

[0014] The image forming apparatus 24 modulates the incident red, green, and blue color lights, and synthesizes the modulated color lights to form image light. The image forming apparatus 24 includes three field lenses 241 provided according to the incident color lights, three incident-side polarizing plates 242, three light modulation elements 243, three exit-side polarizing plates 244, and one color synthesis optical system 245.

[0015] The light modulation element 243 modulates the light from the light source device 3 to form image light. Specifically, the light modulation element 243 modulates the color light incident from the incident-side polarizing plate 242 according to an image signal, and emits the modulated color light. The three light modulation elements 243 include a light modulation element 243R that modulates red light, a light modulation element 243G that modulates green light, and a light modulation element 243B that modulates blue light. As the light modulation element 243, a transmissive liquid crystal panel can be exemplified.

[0016] The color synthesis optical system 245 synthesizes three color lights modulated by the light modulation elements 243R, 243G, and 243B. The image light synthesized by the color synthesis optical system 245 is incident on the projection optical device 26. In this embodiment, the color synthesis optical system 245 is constituted by a substantially rectangular parallelepiped cross dichroic prism, but it may be constituted by a plurality of dichroic mirrors.

[0017] The housing 25 for optical components houses the above-described homogenizing optical system 21, color separation optical system 22, relay optical system 23, and image forming device 24 therein. Note that an optical axis Ax1 in design is set for the image projection device 2, and the housing 25 for optical components holds the homogenizing optical system 21, color separation optical system 22, relay optical system 23, and image forming device 24 at predetermined positions on the optical axis Ax1. The light source device 3 and the projection optical device 26 are arranged at predetermined positions on the optical axis Ax1. The projection optical device 26 projects the image light incident from the image forming device 24 onto a projection surface such as a screen. That is, the projection optical device 26 projects the image light formed by the image forming device 24. The projection optical device 26 can be, for example, a combined lens including a plurality of lenses (not shown) and a lens barrel 261 that houses the plurality of lenses.

[0018] [Configuration of Light Source Device] FIG. 2 is a schematic diagram showing the light source device 3. The light source device 3 emits illumination light for illuminating the image forming device 24 to the homogenizing optical system 21. As shown in FIG. 2, the light source device 3 includes a light source housing 31, a light source 32, an afocal optical element 33, a first phase difference element 34, a diffusing transmission element 35, a light separation and synthesis element 36, a first condenser element 37, a second phase difference element 38, a second condenser element 39, a diffusing optical element 40, a third phase difference element 41, and a wavelength conversion device 5A.

[0019] An optical axis Ax2 extending linearly and an optical axis Ax3 that is orthogonal to the optical axis Ax2 and extends linearly are set for the light source device 3. The optical axis Ax3 overlaps with the optical axis Ax1 in the homogenizing optical system 21. The light source 32, the afocal optical element 33, the first phase difference element 34, the diffuse transmission element 35, the light separation / combination element 36, the second phase difference element 38, the second light-collecting element 39, and the diffusion optical element 40 are arranged on the optical axis Ax2. The wavelength converter 5A, the first light-collecting element 37, the light separating / combining element 36, and the third phase difference element 41 are arranged on the optical axis Ax3. In the following description, the three mutually orthogonal directions are referred to as the +X direction, the +Y direction, and the +Z direction. In this embodiment, the +X direction is the direction in which the light source 32 emits light along the optical axis Ax2, and the +Z direction is the direction in which the light source device 3 emits illumination light along the optical axis Ax3. Although not shown in the drawings, the direction opposite to the +X direction is referred to as the -X direction, the direction opposite to the +Y direction is referred to as the -Y direction, and the direction opposite to the +Z direction is referred to as the -Z direction.

[0020] [Configuration of the light source housing] The light source housing 31 accommodates a light source 32, an afocal optical element 33, a first phase difference element 34, a diffuse transmission element 35, a light separation / combination element 36, a first light-collecting element 37, a second phase difference element 38, a second light-collecting element 39, a diffusive optical element 40, a third phase difference element 41, and the wavelength conversion device 5A. The light source housing 31 is a sealed housing that makes it difficult for dust and other particles to enter inside.

[0021] [Light source configuration] The light source 32 includes at least one solid-state light-emitting element 321, which emits light incident on the diffusing optical element 40 and the wavelength conversion device 5A in the +X direction. The solid-state light-emitting element 321 emits blue light, which is excitation light. For example, the solid-state light-emitting element 321 is an LD (Laser Diode) that emits laser light with a peak wavelength of 440 nm. The light emitted by the light source 32 is s-polarized blue light BLs for the light separating / combining element 36. However, the light is not limited to this, and the light emitted by the light source 32 may be p-polarized blue light BLp for the light separating / combining element 36, or may be blue light that is a mixture of s-polarized and p-polarized light. In the latter case, the first phase difference element 34 can be omitted.

[0022] [Configuration of afocal optical elements] The afocal optical element 33 adjusts the beam diameter of the blue light BLs incident from the light source 32 in the +X direction. The afocal optical element 33 is composed of a lens 331 that condenses the incident light and a lens 332 that collimates the light beam condensed by the lens 331. Note that the afocal optical element 33 may be omitted.

[0023] [Configuration of the first retardation element] The first retardation element 34 is provided between the lens 331 and the lens 332. The first retardation element 34 converts a part of the incident blue light BLs into blue light BLp and emits light including s-polarized blue light BLs and p-polarized blue light BLp. The first retardation element 34 may be rotated about a rotation axis along the optical axis Ax2 by a rotating device. In this case, the ratio of the s-polarized light component to the p-polarized light component in the blue light emitted from the first retardation element 34 can be adjusted according to the rotation angle of the first retardation element 34.

[0024] [Configuration of the diffusing transmission element] The diffusing transmission element 35 equalizes the illuminance distribution of the blue lights BLp and BLs incident from the lens 332 in the +X direction. The blue lights BLs and BLp that have passed through the diffusing transmission element 35 are incident on the optical separation / combination element 36. Examples of the configuration of the diffusing transmission element 35 include a configuration having a hologram, a configuration in which a plurality of small lenses are arranged on a plane orthogonal to the optical axis, and a configuration in which the surface through which light passes is a rough surface. Note that instead of the diffusing transmission element 35, a homogenizer optical element having a pair of multi-lenses may be employed.

[0025] [Configuration of the optical separation / combination element] The optical separation / combination element 36 has a function as an optical separation element that separates the incident light and a function as an optical combination element that combines the light incident from two directions. The optical separation / combination element 36 is a polarization beam splitter that separates the s-polarized light component and the p-polarized light component contained in the incident light. Specifically, the optical separation / combination element 36 reflects the s-polarized light component and transmits the p-polarized light component. Also, the optical separation / combination element 36 has a color separation characteristic of transmitting light with a wavelength of a predetermined value or longer, regardless of whether it is the s-polarized light component or the p-polarized light component. Therefore, among the blue lights BLp and BLs incident from the diffusion transmission element 35 to the optical separation / combination element 36, the p-polarized blue light BLp transmits through the optical separation / combination element 36 in the +X direction and is incident on the second retardation element 38. On the other hand, the s-polarized blue light BLs is reflected in the -Z direction by the optical separation / combination element 36 and is incident on the first condenser element 37. Note that the optical separation / combination element 36 may have a function of a half mirror that allows part of the light incident from the light source 32 through the diffusion transmission element 35 to pass through and reflects the remaining light, and a function of a dichroic mirror that reflects the blue light incident from the diffusion optical element 40, transmits the fluorescence incident from the wavelength conversion device 5A and having a wavelength longer than that of the blue light. In this case, the first retardation element 34 can be omitted.

[0026] [Configuration of the First Condenser Element] The first condenser element 37 constitutes a pickup optical system. The first condenser element 37 condenses the blue light BLs reflected in the -Z direction by the optical separation / combination element 36 onto the phosphor 52 included in the wavelength conversion device 5A. Also, the first condenser element 37 collimates the fluorescence YL incident from the phosphor 52 in the +Z direction and emits the collimated fluorescence YL to the optical separation / combination element 36. In the present embodiment, the first condenser element 37 is composed of three lenses 371, 372, and 373, but the number of lenses constituting the first condenser element 37 is not limited. Note that the size of the excitation light irradiation region SP in the phosphor 52 described later is defined by the profile of the first condenser element 37.

[0027] [Schematic Configuration of the Wavelength Conversion Device] The wavelength converter 5A converts the wavelength of the blue light BLs incident from the first light collecting element 37 and emits the fluorescence YL. The wavelength converter 5A is a so-called reflective wavelength converter, and emits the fluorescence YL in the opposite direction to the incident direction of the blue light BLs, which is excitation light. The configuration of the wavelength converter 5A will be described in detail later.

[0028] The fluorescence YL emitted in the +Z direction from the wavelength conversion device 5A is collimated by the first light collecting element 37 and then enters the light separation / combining element 36. As described above, the light separation / combining element 36 has the property of transmitting the fluorescence YL, and therefore the fluorescence YL that enters the light separation / combining element 36 along the +Z direction passes through the light separation / combining element 36 and enters the third phase difference element 41.

[0029] [Configuration of the second phase difference element] The second phase difference element 38 is disposed in the +X direction with respect to the light separation / combining element 36. That is, the second phase difference element 38 is disposed between the light separation / combining element 36 and the second light collecting element 39. The second phase difference element 38 converts the blue light BLp that has passed through the light separation / combining element 36 in the +X direction into circularly polarized blue light BLc. The blue light BLc that has passed through the second phase difference element 38 in the +X direction is incident on the second light collecting element 39.

[0030] [Configuration of the second light-collecting element] The second light collecting element 39 collects the blue light BLc that has passed through the light separating / combining element 36 in the +X direction and is incident from the second phase difference element 38 onto the diffusing optical element 40. The second light collecting element 39 also collimates the light that is incident from the diffusing optical element 40 in the -X direction and outputs the collimated light to the second phase difference element 38. In this embodiment, the second light collecting element 39 is composed of three lenses 391, 392, and 393, but the number of lenses that constitute the second light collecting element 39 is not limited.

[0031] [Configuration of diffusive optical element] The diffusing optical element 40 diffuses the incident blue light BLc at the same diffusion angle as the fluorescence YL emitted from the wavelength conversion device 5A. Specifically, the diffusing optical element 40 reflects the blue light BLc incident in the +X direction from the second light collecting element 39 in the -X direction to diffuse it. The diffusing optical element 40 is a reflecting element that performs Lambertian reflection on the incident blue light BLc. The diffusing optical element 40 may be rotated around a rotation axis parallel to the optical axis Ax2 by a rotating device. The blue light BLc diffused by the diffusing optical element 40 passes through the second light-collecting element 39 and then enters the second phase difference element 38. When the blue light BLc incident on the diffusing optical element 40 is reflected by the diffusing optical element 40, it is converted into circularly polarized light with the opposite rotation direction. Therefore, the blue light BLc incident on the second phase difference element 38 via the second light-collecting element 39 is converted into s-polarized blue light BLs by the second phase difference element 38. The blue light BLs is then reflected in the +Z direction by the light separating / combining element 36 and enters the third phase difference element 41. In other words, the light incident on the third phase difference element 41 from the light separating / combining element 36 is white light containing a mixture of blue light BLs and fluorescence YL.

[0032] [Configuration of the third phase difference element] The third phase difference element 41 converts the white light containing the blue light BLs and the fluorescence YL incident from the light separating / combining element 36 into white light containing a mixture of s-polarized light and p-polarized light. The white light converted in this manner is emitted in the +Z direction as illumination light LT and enters the homogenizing optical system 21 described above.

[0033] [Detailed configuration of wavelength conversion device] Fig. 3 is a perspective view showing the wavelength converter 5A as viewed from the excitation light incident side, and Fig. 4 is a perspective view showing the wavelength converter 5A as viewed from the opposite side to the excitation light incident side. Fig. 5 is an exploded perspective view showing the wavelength converter 5A as viewed from the excitation light incident side, and Fig. 6 is an exploded perspective view showing the wavelength converter 5A as viewed from the opposite side to the excitation light incident side. Note that in Figs. 3 to 6, reference numerals are assigned to only some of the fins 551 among the multiple fins 551, and reference numerals are assigned to only some of the fins 5841 among the multiple fins 5841. As described above, the wavelength conversion device 5A emits converted light obtained by converting the wavelength of incident excitation light. Specifically, the wavelength conversion device 5A converts the wavelength of incident blue light and emits fluorescent light YL including green light and red light. As shown in FIGS. 3 to 6, the wavelength conversion device 5A includes a fluorescent rotator 51 and a drive device 56A. In the following description, the -Z direction is the direction in which excitation light is incident on the wavelength conversion device 5A. The +Z direction is the incident side of the excitation light in the wavelength conversion device 5A, and the -Z direction is the side opposite to the incident side of the excitation light in the wavelength conversion device 5A.

[0034] [Configuration of Fluorescent Rotator] The fluorescent rotator 51 is rotated about the rotation axis Rx by the drive device 56A, converts the wavelength of incident excitation light, and emits fluorescent light YL as converted light. The fluorescent rotator 51 includes a phosphor 52, a support substrate 53, a reflection part 54, and heat radiation fins 55.

[0035] [Configuration of Phosphor] The phosphor 52 contains a phosphor that is excited when excitation light is incident and emits converted light having a wavelength longer than that of the excitation light. In the present embodiment, the phosphor emits fluorescent light YL having a wavelength longer than that of the blue light BLs, which is the excitation light. As shown in FIGS. 3, 5, and 6, the phosphor 52 is formed in a rectangular shape centered on the rotation axis Rx when viewed from the incident side of the excitation light. As shown in FIGS. 5 and 6, the phosphor 52 has an incident surface 52A, a first side surface 52B, and a second side surface 52C.

[0036] The incident surface 52A is the surface of the phosphor 52 facing the +Z direction. Excitation light is incident on the incident surface 52A from the first condenser element 37. Further, the incident surface 52A is also a fluorescent light emission surface that emits fluorescent light YL. The first side surface 52B is the surface of the phosphor 52 facing the -Z direction and is the surface opposite to the incident surface 52A. The second side surface 52C is the surface connecting the incident surface 52A and the first side surface 52B. The phosphor 52 is fixed to a first surface 53A of the support substrate 53. More specifically, the phosphor 52 is disposed in a recess 531 provided in the first surface 53A. The phosphor 52 is then fixed to the inner surface of the recess 531 by an adhesive at a first side surface 52B and a second side surface 52C.

[0037] [Support substrate configuration] The support substrate 53 is a metal member that is connected to a connecting member 58A of the drive device 56A while supporting the phosphor 52, and is rotated around a rotation axis Rx by the drive device 56A. As shown in Figures 3 to 6, the support substrate 53 has a first surface 53A and a second surface 53B, as well as a recess 531 shown in Figures 3 and 5 and an engagement portion 532 shown in Figure 6.

[0038] 3 and 5, the first surface 53A is a surface of the support substrate 53 facing the +Z direction, and is a surface on which the phosphor 52 is disposed. A recess 531 is provided in the center of the first surface 53A. The recess 531 is formed in a substantially square shape when viewed from the +Z direction, and is recessed in the -Z direction from the first surface 53A. Since the phosphor 52 is disposed inside the recess 531, the recess 531 is an arrangement portion where the phosphor 52 is disposed. Heat generated in the phosphor 52 is transferred to the support substrate 53. Reflecting portions 54 are provided on the bottom surface and inner surface of recess 531. Reflecting portions 54 reflect light incident from phosphor 52 arranged in recess 531 toward phosphor 52. Such reflecting portions 54 may be reflective layers formed by vapor deposition or the like on the bottom surface and inner surface of recess 531. If the light reflectance of the bottom surface and inner surface of recess 531 is sufficiently high, the bottom surface and inner surface of recess 531 may be used as reflecting portions 54. An adhesive (not shown) is provided on the reflecting portion 54. That is, an adhesive such as silver paste or silicone adhesive is provided between the support substrate 53 and the phosphor 52 in the recess 531. The adhesive fixes the phosphor 52 to the inside of the recess 531.

[0039] 4 and 6, the second surface 53B is a surface of the support substrate 53 facing the -Z direction and is the surface opposite to the first surface 53A. An engagement portion 532 and a heat dissipation fin 55 are provided on the second surface 53B. The engaging portion 532 protrudes in the −Z direction from approximately the center of the second surface 53B and is a portion that engages with the driving device 56A. The engaging portion 532 has a hole 533 into which an insertion portion 583 of a connecting member 58A (described later) of the driving device 56A is inserted. When the insertion portion 583 is inserted into the hole 533, the supporting substrate 53 and the connecting member 58A are connected, thereby connecting the supporting substrate 53 and the driving device 56A.

[0040] [Heat dissipation fin configuration] 3 to 6, the heat dissipation fins 55 are provided on the second surface 53B of the support substrate 53, and dissipate heat from the phosphor 52 transferred to the support substrate 53. The heat dissipation fins 55 have a plurality of fins 551 provided around the engagement portion 532. 6, each of the multiple fins 551 is formed in an arc shape extending in the opposite direction to the rotation direction of the support substrate 53 about the rotation axis Rx as it moves from the engagement portion 532 toward the outside of the support substrate 53 when viewed from the -Z direction. Therefore, when the support substrate 53 is rotated by the drive device 56A, an airflow is generated that flows between the multiple fins 551 from the engagement portion 532 side toward the outer edge side of the support substrate 53. The multiple fins 551 transfer the transferred heat of the phosphors 52 to the airflow, thereby dissipating the heat of the phosphors 52.

[0041] [Driver configuration] The driving device 56A rotates the support substrate 53 on which the phosphor 52 is provided, thereby moving the region irradiated with the excitation light in the phosphor 52. As shown in FIGS. 3 to 6, the driving device 56A has a motor 57 and a connecting member 58A.

[0042] The motor 57 generates a driving force for rotating the support substrate 53. The motor 57 has a motor body 571 and a hub 572. The motor body 571 is connected to the control device via a flexible printed circuit board FP, and is driven by the power supplied from the control device to rotate the hub 572. Although detailed illustration is omitted, the motor body 571 has a rotor that rotates about the rotation axis Rx and a stator that rotates the rotor. Note that the flexible printed circuit board FP extends in the -Y direction from the motor body 571. The hub 572 is disposed in the +Z direction with respect to the motor body 571. The hub 572 is fixed to the rotor of the motor body 571 and is rotated about the rotation axis Rx together with the rotor. A connecting member 58A is connected to the hub 572.

[0043] The connecting member 58A is a disk-shaped member that is connected to the support substrate 53 and the hub 572 and is rotated about the rotation axis Rx by the motor body 571. As shown in FIGS. 3, 5, and 6, the connecting member 58A has a first surface 581 and a second surface 582, and as shown in FIGS. 5 and 6, has an insertion portion 583, a blower fin 584, and a connecting portion 585. The first surface 581 is a surface of the connecting member 58A that faces in the +Z direction. As shown in FIG. 5, an insertion portion 583 and a blower fin 584 are provided on the first surface 581. The second surface 582 is a surface of the connecting member 58A that is opposite to the first surface 581. As shown in FIG. 6, a connecting portion 585 is provided on the second surface 582. The connecting portion 585 is a recess provided on the second surface 582 and is recessed in the -Z direction from the second surface 582. The connecting portion 585 is connected to the hub 572.

[0044] FIG. 7 is a side view showing the wavelength conversion device 5A as viewed from a direction orthogonal to the incident direction of the excitation light with respect to the wavelength conversion device 5A. As shown in FIGS. 5 and 6, the insertion portion 583 is a columnar portion that protrudes in the +Z direction along the rotation axis Rx from the center of the first surface 581. As shown in FIG. 6, the insertion portion 583 is inserted into the hole portion 533 of the support substrate 53 from the -Z direction, whereby the support substrate 53 and the connecting member 58A are connected. At this time, as shown in FIG. 7, a gap GP is provided between the first surface 581 of the connecting member 58A and the second surface 53B of the support substrate 53. More specifically, a gap GP is provided between the +Z-direction end of the air blowing fins 584 of the connecting member 58A and the -Z-direction end of the heat radiation fins 55 provided on the second surface 53B of the support substrate 53. Note that the thermal conductivity of the connecting member 58A is smaller than that of the support substrate 53. Therefore, when the connecting member 58A and the support substrate 53 are connected by the insertion portion 583, the heat transmitted from the support substrate 53 to the connecting member 58A is less likely to be transmitted to the motor 57.

[0045] As shown in FIG. 5, the air blowing fins 584 are provided at positions facing the support substrate 53 in the +Z direction along the rotation axis Rx of the drive device 56A. The air blowing fins 584 rotate together with the support substrate 53 to allow an air flow to circulate through the support substrate 53. That is, when the connecting member 58A is rotated, the air blowing fins 584 suck the gas around the connecting member 58A and circulate the sucked gas as a cooling gas to the support substrate 53. The air blowing fins 584 are constituted by a plurality of fins 5841 provided around the insertion portion 583. Each of the plurality of fins 5841 is formed in an arc shape that extends in the rotation direction of the connecting member 58A from the insertion portion 583 side toward the outer edge of the connecting member 58A. Such air blowing fins 584 can increase the heat radiation efficiency of the phosphor by the heat radiation fins 55 by circulating the cooling gas through the heat radiation fins 55. In addition, since the air can be circulated along the motor body 571 in the process of the air blowing fins 584 sucking the gas, the motor body 571, and thus the drive device 56A, can be cooled.

[0046] [Relationship between the excitation light irradiation region and the rotation center in the phosphor] FIG. 8 is a diagram showing the positional relationship between the excitation light irradiation region SP on the incident surface 52A of the phosphor 52 and the rotation center RC of the support substrate 53. In the present embodiment, as shown in FIG. 8, when viewed from the incident side of the excitation light with respect to the wavelength conversion device 5A, the rotation center RC of the support substrate 53 and the center of the phosphor 52 coincide. On the other hand, when viewed from the incident side of the excitation light with respect to the wavelength conversion device 5A, the rotation center RC of the support substrate 53 and the irradiation center SC which is the center of the excitation light irradiation region SP do not coincide. Note that the rotation center RC is included in the irradiation region SP. That is, when viewed from the incident side of the excitation light with respect to the wavelength conversion device 5A, the irradiation region SP is set at a position on the phosphor 52 that includes the rotation center RC and where the irradiation center SC does not coincide with the rotation center RC.

[0047] FIG. 9 is a diagram showing the positional relationship between the locus of the irradiation region SP when the support substrate 53 rotates and the rotation center RC. Note that FIG. provides eight positions PS1 to PS8 on the phosphor 52 where the irradiation region SP is equally spaced in the circumferential direction centered on the rotation center RC. When viewed from the incident side of the excitation light, when the support substrate 53 rotates counterclockwise about the rotation center RC, the excitation light irradiation region SP rotates clockwise relative to the phosphor 52 about the rotation center RC. At this time, as shown in FIG. 9, the irradiation region SP continuously moves to the equally spaced positions PS1 to PS8 in the circumferential direction centered on the rotation center RC.

[0048] Here, as shown in FIG. 8, of the two portions where the virtual line VL connecting the irradiation center SC and the rotation center RC intersects the outer edge of the irradiation region SP, the portion far from the rotation center RC is defined as the first portion PT1, and the portion close to the rotation center RC is defined as the second portion PT2. When the support substrate 53 is rotated, as shown by the dotted lines in FIGS. 8 and 9, the irradiation region SP draws a circular locus C1 centered on the rotation center RC by the first portion PT1. Further, when the support substrate 53 is rotated, as shown by the dashed-dotted line in FIGS. 8 and 9, a circular locus C2 centered on the rotation center RC is drawn by the second portion PT2, and as shown by the double-dashed-dotted line in FIGS. 8 and 9, a circular locus C3 centered on the rotation center RC is drawn by the irradiation center SC. The third portion PT3 shown in FIG. 8 is a portion on the opposite side of the irradiation center SC from the portion corresponding to the rotation center RC in the irradiation region SP.

[0049] To describe in detail the position of the irradiation area SP in the phosphor 52, the position of the irradiation area SP in the phosphor 52 is set so that not only is the irradiation center SC offset from the rotation center RC, but also the locus C3 is positioned outside the locus C2 relative to the rotation center RC. In other words, the position of the irradiation area SP in the phosphor 52 is set so that the locus C3 is located outside the circular locus C2 described by the second part PT2 located on the opposite side of the irradiation center SC from the first part PT1 of the irradiation area SP that describes the outer edge of the locus C1 of the irradiation area SP when the support substrate 53 rotates once.

[0050] [Intensity of excitation light in the irradiated area] Fig. 10 is a diagram showing the intensity distribution of the excitation light in the irradiation region SP, in other words, Fig. 10 is a graph showing the intensity ratio of the excitation light in the irradiation region SP. 10, in the irradiation region SP, the intensity of the excitation light irradiated at the irradiation center SC is the highest, and the intensity of the irradiated excitation light decreases with increasing distance from the irradiation center SC. That is, in the phosphor irradiated with the excitation light, the temperature of the part corresponding to the irradiation center SC is the highest, and the temperature of the part onto which the excitation light is incident decreases with increasing distance from the irradiation center SC. Thus, in the irradiation region SP, the irradiation center SC is the peak portion where the intensity of the excitation light is at its maximum.

[0051] FIG. 11 is a diagram showing the amount of incident excitation light on the portion of the phosphor 52 corresponding to the irradiation center SC of the irradiation region SP located at the position PS4, the amount of incident excitation light on the portion of the phosphor 52 corresponding to the third portion PT3 of the irradiation region SP located at the position PS4, and the amount of incident excitation light on the portion of the phosphor 52 corresponding to the rotation center RC when the phosphor 52 makes one rotation about the rotation center RC. In other words, FIG. 11 is a diagram showing the amount of heat generation in the portion of the phosphor 52 corresponding to the irradiation center SC of the irradiation region SP located at the position PS4, the amount of heat generation in the portion of the phosphor 52 corresponding to the third portion PT3 of the irradiation region SP located at the position PS4, and the amount of heat generation in the portion of the phosphor 52 corresponding to the rotation center RC when the phosphor 52 makes one rotation. The times T1 to T8 on the horizontal axis of FIG. 11 indicate the elapsed time from the timing when the irradiation region SP is located at the position PS1, and this elapsed time indicates the position of the irradiation region SP. For example, the irradiation region SP is located at the position PS2 at time T2, at the position PS4 at time T4, and at the position PS7 at time T7.

[0052] As shown in FIG. 8, when the portion of the phosphor 52 corresponding to the irradiation center SC of the irradiation region SP located at the position PS4 is defined as the irradiation center portion K4C, the portion of the phosphor 52 corresponding to the third portion PT3 of the irradiation region SP located at the position PS4 is defined as the phosphor third portion K43, and the portion of the phosphor 52 corresponding to the rotation center RC is defined as the rotation center portion KRC, in FIG. 11, the amount of incident excitation light on the irradiation center portion K4C and the amount of heat generation in this portion during one rotation of the phosphor 52 are indicated by a dashed-dotted line, the amount of incident excitation light on the phosphor third portion K43 and the amount of heat generation in this portion during one rotation of the phosphor 52 are indicated by a solid line, and the amount of incident excitation light on the rotation center portion KRC and the amount of heat generation in this portion during one rotation of the phosphor 52 are indicated by a dotted line.

[0053] As described above, as time elapses from time T1 to time T8 due to the rotation of the phosphor 52, the position of the irradiation region SP continuously moves from position PS1 to position PS8. For this reason, the incident light amount of the excitation light on the irradiation center portion K4C and the incident light amount of the excitation light on the third phosphor portion K43 each increase as the irradiation region SP moves toward position PS4, become maximum when the irradiation region SP is at position PS4, and decrease as the irradiation region SP moves away from position PS4.

[0054] And the incident light amount of the excitation light on the third phosphor portion K43 becomes zero until the irradiation region SP reaches from position PS5 to position PS3, and during this period, the third phosphor portion K43 is cooled. Also, the incident light amount of the excitation light on the irradiation center portion K4C becomes zero from when the irradiation region SP is between position PS5 and position PS6 until it reaches between position PS2 and position PS3, and during this period, the irradiation center portion K4C is cooled. On the other hand, the incident light amount of the excitation light on the rotation center portion KRC that is always included in the irradiation region SP is constant regardless of the position of the irradiation region SP. The heat generation amounts in the irradiation center portion K4C, the third phosphor portion K43, and the rotation center portion KRC are also the same as described above. As shown in FIG. 11, the incident light amount of the excitation light on the irradiation center portion K4C when the irradiation region SP is at position PS4 is larger than the incident light amount of the excitation light on the third phosphor portion K43 and the incident light amount of the excitation light on the rotation center portion KRC, and the incident light amount of the excitation light on the third phosphor portion K43 and the incident light amount of the excitation light on the rotation center portion KRC are the same.

[0055] When the irradiation region SP of the excitation light having the intensity distribution shown in FIG. 10 is located at the position PS4 in the phosphor 52, as shown in FIG. 11, in the phosphor 52, the incident light amount with respect to the irradiation center portion K4C is the highest, and the heat generation amount of the irradiation center portion K4C becomes the highest. That is, when the irradiation region SP is located at the position PS4, the incident light amount of the excitation light to the rotation center portion KRC is less than the incident light amount of the excitation light to the irradiation center portion K4C, and the heat generation amount in the rotation center portion KRC is less than the heat generation amount in the irradiation center portion K4C. When the irradiation region SP is located at the position PS4, the incident light amount of the excitation light to the third phosphor portion K43 is the same as the incident light amount of the excitation light to the rotation center portion KRC, and the heat generation amount in the third phosphor portion K43 is the same as the heat generation amount in the rotation center portion KRC. Although illustration is omitted, even when the irradiation region SP of the excitation light exists at a position other than the position PS4 among the positions PS1 to PS8, the incident light amount for each portion and the heat generation amount in each portion are the same as described above.

[0056] Here, as described above, when viewed from the incident side of the excitation light, since the irradiation region SP of the excitation light includes the rotation center RC, even when the phosphor 52 rotates once, the excitation light continues to be incident on the position of the phosphor 52 corresponding to the rotation center RC. Even in this case, the integrated light amount of the excitation light irradiated to the rotation center portion KRC while the phosphor 52 rotates once is less than the integrated light amount of the excitation light irradiated to the irradiation center portion K4C while the phosphor 52 rotates once. That is, in the integrated light amount of the excitation light irradiated to the phosphor 52 per rotation of the support substrate 53, the integrated light amount of the excitation light irradiated to the rotation center RC is less than the integrated light amount of the excitation light irradiated by the irradiation region SP located at any one of the positions PS1 to PS8, which is one portion on the locus C3 of the irradiation center SC in the phosphor 52. Similarly, the heat generation amount in the rotation center portion KRC while the phosphor 52 rotates once is less than the heat generation amount in the irradiation center portion K4C while the phosphor 52 rotates once. From this, it is possible to suppress the temperature of the rotation center portion KRC from becoming extremely higher than the temperature of other portions in the phosphor 52. Thereby, deterioration of the phosphor 52 is suppressed, and a decrease in the luminous efficiency in the phosphor 52 is also suppressed.

[0057] [Position relationship between the rotation center and the irradiation center] FIG. 12 is a diagram showing a deformation of the position of the irradiation region SP in the phosphor 52. In the phosphor 52, it is conceivable to set the position of the irradiation region SP having the intensity distribution shown in FIG. 10 so that the locus C3 is located inside the locus C2 as shown in FIG. 12. In such a case, the diameter of the locus C1 indicating the region where the excitation light is incident when the phosphor 52 makes one rotation can be reduced. However, in such a case, the distance between the rotation center portion KRC where the excitation light continues to be incident and the irradiation center SC becomes small. That is, the amount of incident light on the rotation center portion KRC increases, and the calorific value of the rotation center portion KRC tends to increase. On the other hand, in the wavelength conversion device 5A, the position of the irradiation region SP in the phosphor 52 is set so that the locus C3 is located outside the locus C2 as shown in FIG. 8. Thereby, while the irradiation region SP includes the rotation center portion KRC, the distance between the rotation center portion KRC and the irradiation center SC can be increased. Thereby, the amount of incident light on the rotation center portion KRC can be reduced, and the calorific value of the rotation center portion KRC can be reduced. Therefore, it is possible to suppress the temperature of the rotation center portion KRC from becoming extremely higher than the temperatures of other positions in the phosphor 52.

[0058] [Effects of the First Embodiment] The projector 1 according to the present embodiment described above has the following effects. The projector 1 includes a light source device 3, an image forming device 24 that modulates the light emitted from the light source device 3 to form image light, and a projection optical device 26 that projects the formed image light. The light source device 3 includes a light source 32 that emits excitation light, a wavelength conversion device 5A, and a first condenser element 37 that guides the excitation light to the phosphor 52 of the wavelength conversion device 5A. The first condenser element 37 has lenses 371 to 373.

[0059] The wavelength conversion device 5A includes a phosphor 52 irradiated with excitation light, a support substrate 53 on which the phosphor 52 is disposed, and a drive device 56A that rotates the support substrate 53. The rotation center RC of the support substrate 53 and the irradiation center SC that is the center of the excitation light irradiation region SP in the phosphor 52 are displaced from each other. The excitation light irradiation region SP includes the rotation center RC. The phosphor 52 is disposed at a position including the locus C1 of the excitation light irradiation region SP on the rotating support substrate 53.

[0060] According to such a configuration, when the support substrate 53 is rotated by the drive device 56A, the excitation light irradiation region SP can be moved around the rotation center RC of the support substrate 53. Thereby, since the excitation light irradiation region SP in the phosphor 52 is dispersed, an increase in the temperature of the phosphor 52 due to the irradiation of the excitation light can be suppressed. Therefore, deterioration of the phosphor 52 can be suppressed, and a decrease in the light emission efficiency of the phosphor 52 can be suppressed. And thereby, since the amount of incident light on the phosphor 52 can be increased, the luminance of the fluorescence YL output from the wavelength conversion device 5A can be enhanced. Furthermore, since the excitation light irradiation region SP includes the rotation center RC of the support substrate 53, while dispersing the excitation light irradiation region SP in the phosphor 52, the size of the phosphor 52 including the locus C1 of the irradiation region SP during rotation of the support substrate 53 can be reduced. Therefore, the support substrate 53 that supports the phosphor 52 can be made smaller, and thus the wavelength conversion device 5A can be miniaturized.

[0061] Alternatively, the wavelength conversion device 5A includes a phosphor 52 irradiated with excitation light, a support substrate 53 on which the phosphor 52 is disposed, and a drive device 56A that rotates the support substrate 53. The irradiation center SC corresponds to the peak portion where the intensity of the excitation light is maximum in the excitation light irradiation region SP, and is offset from the rotation center RC of the support substrate 53. The excitation light irradiation region SP includes the rotation center RC. The phosphor 52 is disposed at a position including the locus C1 of the excitation light irradiation region SP on the rotating support substrate 53.

[0062] According to such a configuration, since the irradiation center SC corresponding to the peak portion is offset from the rotation center RC of the support substrate 53, when the support substrate 53 rotates by the drive device 56A, the irradiation region SP of the excitation light can be moved around the rotation center RC of the support substrate 53. As a result, the region where the phosphor 52 is irradiated with the excitation light is dispersed, so that the temperature rise of the phosphor 52 can be suppressed. Therefore, deterioration of the phosphor 52 can be suppressed, and a decrease in the luminous efficiency of the phosphor 52 can be suppressed. And thereby, since the incident light amount on the phosphor 52 can be increased, the luminance of the fluorescence YL output from the wavelength conversion device 5A can be enhanced. Furthermore, since the irradiation region SP of the excitation light includes the rotation center RC of the support substrate 53, while dispersing the irradiation region SP of the excitation light in the phosphor 52, the size of the phosphor 52 including the locus C1 of the irradiation region SP of the excitation light during rotation of the support substrate 53 can be reduced. Therefore, the support substrate 53 that supports the phosphor 52 can be made smaller, and thus the wavelength conversion device 5A can be miniaturized.

[0063] Furthermore, by including the above-described wavelength conversion device 5A, the light source device 3 can stably emit light and can be miniaturized. Therefore, the projector 1 can stably project image light and can be miniaturized.

[0064] In the wavelength conversion device 5A, in the integrated light amount of the excitation light irradiated on the phosphor 52 per one rotation of the support substrate 53, the integrated light amount of the excitation light irradiated on the rotation center RC is less than the integrated light amount of the excitation light irradiated on one portion on the locus C3 of the irradiation center SC in the phosphor 52. That is, the integrated light amount of the excitation light irradiated on the rotation center RC while the support substrate 53 makes one rotation is less than the integrated light amount of the excitation light irradiated on one portion on the locus C3 while the support substrate 53 also makes one rotation. For example, in the integrated light amount of the excitation light irradiated on the phosphor 52 per one rotation of the support substrate 53, the integrated light amount of the excitation light irradiated on the rotation center RC is less than the integrated light amount of the excitation light irradiated on the irradiation center portion K4C corresponding to the irradiation center SC when the irradiation region SP is at the position PS4. Note that the irradiation center SC corresponds to the peak portion. This configuration can suppress temperature rise in the portion of the phosphor 52 corresponding to the rotation center RC onto which excitation light is always incident when the support substrate 53 rotates, i.e., the rotation center portion KRC. Therefore, deterioration of the phosphor 52 can be suppressed.

[0065] In the wavelength conversion device 5A, the circular locus C3 drawn by the irradiation center SC when the support substrate 53 makes one rotation is located more outer with respect to the rotation center RC than the circular locus C2 drawn by the portion of the irradiation area SP on the opposite side of the irradiation center SC with respect to the outer edge of the locus C1 of the irradiation area SP when the support substrate 53 makes one rotation. In other words, when the circular locus drawn by the first portion PT1 on the rotation center RC side of the outer edge portions PT1 and PT2 that intersect with the virtual line VL connecting the irradiation center SC and the rotation center RC when the support substrate 53 makes one rotation is defined as locus C2, the locus C3 is located more outer with respect to the rotation center RC than locus C2. The irradiation center SC corresponds to the peak portion.

[0066] As described above, the amount of excitation light irradiated on the irradiation area SP is the highest at the irradiation center SC and the lowest at the outer edge of the irradiation area SP. Here, if the circular locus C3 described by the irradiation center SC is located closer to the rotation center RC than the circular locus C2 described by the first portion PT1, the locus C1 of the irradiation area SP when the support substrate 53 makes one rotation can be made smaller, and the phosphor 52 can be made smaller. However, in such a case, excitation light from a portion of the irradiation area SP with a relatively large amount of irradiation light continues to be incident on the region inside the circular locus C3 described by the irradiation center SC. In this case, it becomes difficult to sufficiently distribute the region of the phosphor 52 irradiated with the excitation light, and the temperature rise in the region of the phosphor 52 corresponding to the rotation center RC is likely to be large. On the other hand, according to the above configuration, the overlapping area between the inner region with respect to the locus C3 and the inner region with respect to the locus C2 can be reduced. At this time, since the inner region with respect to the locus C2 is irradiated with the excitation light in the outer edge portion where the irradiation light amount is relatively low in the irradiation region SP, the temperature rise in the inner region can be suppressed. Therefore, it becomes easier to achieve dispersion of the region where the excitation light is irradiated, and the temperature rise of the region of the phosphor 52 corresponding to the rotation center RC can be suppressed.

[0067] The wavelength conversion device 5A includes heat radiation fins 55. The heat radiation fins 55 are provided on the second surface 53B of the support substrate 53, which is opposite to the first surface 53A on which the phosphor 52 is disposed. According to such a configuration, the heat radiation fins 55 can facilitate the heat radiated from the phosphor 52 to the support substrate 53 to be dissipated. Therefore, the heat dissipation effect of the heat transferred from the phosphor 52 can be enhanced.

[0068] The wavelength conversion device 5A includes air blowing fins 584. The air blowing fins 584 are provided at a position facing the support substrate 53 in the +Z direction along the rotation axis Rx of the driving device 56A. The air blowing fins 584 rotate together with the support substrate 53 to allow an air flow to circulate through the support substrate 53. According to such a configuration, the air blowing fins 584 can allow an air flow to circulate through the support substrate 53 and can also allow an air flow to circulate through the driving device 56A. Therefore, the cooling efficiency of each of the support substrate 53 and the driving device 56A can be enhanced.

[0069] In the wavelength conversion device 5A, the outer shape of the phosphor 52 is rectangular including the locus C1 of the circle drawn by the irradiation region SP when the support substrate 53 makes one rotation as viewed from the incident side of the excitation light to the phosphor 52. Here, some of the phosphors 52 are cut out from a disk-shaped phosphor disk and used. By forming such a phosphor 52 in the above rectangular shape, the productivity of the phosphor 52 can be enhanced, and thus the manufacturing cost of the wavelength conversion device 5A can be reduced.

[0070] In the wavelength conversion device 5A, the support substrate 53 has a recess 531 in which the phosphor 52 is disposed. The phosphor 52 has an incident surface 52A, a first side surface 52B, and a second side surface 52C. The incident surface 52A is the surface on which the excitation light is incident on the phosphor 52. The first side surface 52B is the surface on the phosphor 52 that is opposite to the incident surface 52A. The second side surface 52C is the surface that connects the incident surface 52A and the first side surface 52B. The phosphor 52 is fixed to the recess 531 by an adhesive with the first side surface 52B and the second side surface 52C. According to such a configuration, even if the support substrate 53 rotates and a centrifugal force acts on the phosphor 52, the inner surface of the recess 531 can be used as a receiving surface for the centrifugal force acting on the phosphor 52 when the support substrate 53 rotates. Therefore, peeling of the phosphor 52 from the support substrate 53 can be suppressed, and the phosphor 52 can be stably disposed on the support substrate 53. In addition, the inner surface of the recess 531 can be used as a reflecting surface that reflects the light emitted from the phosphor 52. Thereby, the emission surface through which the light is emitted from the phosphor 52 to the outside of the recess 531 can be defined as the incident surface 52A. Therefore, it is possible to facilitate the extraction of light from the phosphor 52.

[0071] In the wavelength conversion device 5A, the drive device 56A includes a motor 57 and a connecting member 58A. The connecting member 58A is connected to the support substrate 53. The motor 57 rotates the connecting member 58A to rotate the support substrate 53. The thermal conductivity of the connecting member 58A is smaller than the thermal conductivity of the support substrate 53. According to such a configuration, it is possible to suppress the heat of the phosphor 52 from being transmitted from the support substrate 53 to the motor 57 via the connecting member 58A. Therefore, deterioration of the motor 57 due to heat can be suppressed.

[0072] In the light source device 3, the intensity of the excitation light incident on the phosphor 52 is highest at the irradiation center SC that is the center of the irradiation region SP of the excitation light, and decreases as it goes toward the outside of the irradiation region SP. With this configuration, it is possible to reduce the integrated light amount of excitation light incident on the inside of the circular locus C2 described by the first portion PT1 on the opposite side of the irradiation center SC with respect to the outer edge of the locus C1 of the irradiation area SP when the support substrate 53 makes one rotation. This makes it possible to suppress a temperature rise in the area of the phosphor 52 corresponding to the area inside the locus C2. This makes it possible to further suppress deterioration of the phosphor 52, thereby configuring a light source device 3 that can emit light more stably.

[0073] [Modification of the first embodiment] FIG. 13 is a front view of a wavelength converter 5B, which is a modification of the wavelength converter 5A, viewed from the excitation light incident side. In the wavelength converter 5A described above, the phosphor 52 is formed in a rectangular shape when viewed from the excitation light incident side, and the recess 531 of the support substrate 53 is formed in a rectangular shape when viewed from the excitation light incident side corresponding to the shape of the phosphor 52. However, the shapes of the phosphor 52 and the recess 531 are not limited to this and can be changed as appropriate. For example, wavelength converter 5B has the same configuration and function as wavelength converter 5A, but as shown in Fig. 12, the shapes of phosphor 52 and recess 531 when viewed from the excitation light incident side are different from those of wavelength converter 5A. Specifically, phosphor 52 included in wavelength converter 5B is formed in a circular shape that includes locus C1 of irradiation area SP when phosphor 52 rotates around rotation center RC. Recess 531 in which phosphor 52 is disposed is formed in a circular shape that matches the shape of phosphor 52 when viewed from the excitation light incident side.

[0074] The projector 1 equipped with such a wavelength conversion device 5B exhibits the same effects as the projector 1 equipped with the wavelength conversion device 5A, and also exhibits the following effects. That is, in the wavelength converter 5B, the outer shape of the phosphor 52, when viewed from the incident side of the excitation light to the phosphor 52, is a circle that includes the circular locus C1 of the circle that the irradiation area SP traces when the support substrate 53 makes one rotation. According to such a configuration, the area of the phosphor 52 that is not irradiated with the excitation light can be reduced, so that the phosphor 52 can be made smaller, and therefore the wavelength converter 5B can be made smaller.

[0075] [Second embodiment] Next, a second embodiment of the present disclosure will be described. The projector according to this embodiment has the same configuration as the projector according to the first embodiment, but differs in that the wavelength conversion device includes a ventilation member. In the following description, parts that are the same or substantially the same as parts already described will be assigned the same reference numerals and descriptions thereof will be omitted.

[0076] [Outline of projector and light source device] Fig. 14 is a perspective view of a wavelength converter 5C provided in a projector according to this embodiment, seen from the excitation light incident side, and Fig. 15 is a perspective view showing the wavelength converter 5C seen from the opposite side to the excitation light incident side. Fig. 16 is an exploded perspective view showing the wavelength converter 5C seen from the excitation light incident side, and Fig. 17 is an exploded perspective view showing the wavelength converter 5C seen from the opposite side to the excitation light incident side. Fig. 18 is a cross-sectional view showing the wavelength converter 5C seen from the -X direction intersecting with the -Z direction, which is the incident direction of the excitation light to the phosphor 52. The projector according to this embodiment has the same configuration and functions as the projector 1 according to the first embodiment, except that it has a wavelength conversion device 5C shown in Figures 14 to 18 instead of the wavelength conversion device 5A according to the first embodiment. That is, the light source device 3 according to this embodiment has a wavelength conversion device 5C instead of the wavelength conversion device 5A.

[0077] [Configuration of wavelength conversion device] The wavelength converter 5C emits fluorescence having a wavelength different from that of the incident excitation light, similar to the wavelength converter 5A. The wavelength converter 5C has the same configuration and functions as the wavelength converter 5A according to the first embodiment, except that it includes a drive device 56C instead of the drive device 56A and further includes a blower member 59. The phosphor 52 included in the wavelength converter 5C may be rectangular or circular when viewed from the excitation light incident side.

[0078] [Driver configuration] Similar to the driving device 56A according to the first embodiment, the driving device 56C rotates the support substrate 53 that supports the phosphor 52. The driving device 56C has a motor 57 and a connecting member 58C. Similar to connecting member 58A, connecting member 58C is a disk-shaped member that is connected to support substrate 53 and hub 572 and rotated about rotation axis Rx by motor main body 571. Connecting member 58C has the same configuration and function as connecting member 58A, except that connecting member 58C does not include air blower fins 584. That is, connecting member 58C has a first surface 581, a second surface 582, an insertion portion 583, and a connecting portion 585. As shown in Figure 18, the insertion portion 583 of the connecting member 58C penetrates the air blowing member 59 along the +Z direction and is inserted into the engagement portion 532 of the support substrate 53, thereby connecting the air blowing member 59 and the support substrate 53.

[0079] [Configuration of ventilation components] 14 to 18, the air blower 59 is disposed between the support substrate 53 and the drive device 56C. The air blower 59 is rotated by the drive device 56C about the rotation axis Rx shown in FIGS. 14 and 18, and causes cooling gas to flow through the heat dissipation fins 55 provided on the support substrate 53. More specifically, the air blower 59 rotates integrally with the insertion portion 583 inserted into the support substrate 53, and sends out cooling gas to the heat dissipation fins 55.

[0080] As shown in FIGS. 16 to 18, the air blowing member 59 has a ring-shaped portion 591, a through-hole 592, and air blowing fins 593. The ring-shaped portion 591 is a portion that is connected to the insertion portion 583. The ring-shaped portion 591 has a through-hole 592 formed therein. Through-hole 592 is a hole that passes through ring-shaped portion 591 along the Z-axis. Insertion portion 583 of connecting member 58C is inserted into through-hole 592 from the -Z direction. When insertion portion 583 is fitted into through-hole 592, connecting member 58C and blower member 59 are connected to each other. The air blowing fin 593 is composed of a plurality of fins 594 protruding from the outer peripheral edge of the ring-shaped portion 591 to the outside of the ring-shaped portion 591 when viewed from the +Z direction. When the air blowing member 59 rotates integrally with the connecting member 58C, the air blowing fin 593 sucks the gas in the -Z direction with respect to the heat radiating fin 55 and around the driving device 56C, and sends out the sucked gas in the +Z direction as cooling gas, thereby allowing the cooling gas to flow through the heat radiating fin 55. As a result, the flow rate of the cooling gas flowing through the heat radiating fin 55 increases, and thus the heat radiation efficiency of the phosphor 52 by the heat radiating fin 55 is enhanced.

[0081] [Effects of the Second Embodiment] The projector according to the present embodiment described above has the same effects as the projector 1 according to the first embodiment, and in addition, has the following effects. The wavelength conversion device 5C includes an air blowing member 59, and the air blowing member 59 includes an air blowing fin 593 provided at a position facing the support substrate 53 in the +Z direction along the rotation axis Rx of the driving device 56C. The air blowing fin 593 rotates together with the support substrate 53 to allow an air flow to pass through the support substrate 53. That is, the wavelength conversion device 5C includes the air blowing fin 593. According to such a configuration, the air blowing fin 593 that rotates together with the support substrate 53 can allow an air flow to pass through the support substrate 53. In addition, the air blowing fin 593 can allow an air flow to pass through the driving device 56C, for example, the motor 57. Therefore, the cooling efficiency of each of the support substrate 53 and the driving device 56C can be enhanced.

[0082] [Modifications of the Embodiment] The present disclosure is not limited to the above-described embodiments, and modifications, improvements, etc. within the scope that can achieve the object of the present disclosure are included in the present disclosure. In each of the above embodiments, the intensity of the excitation light at the irradiation center SC, which is the center of the irradiation region SP, is highest in the irradiation region SP, and the intensity of the excitation light decreases with increasing distance from the irradiation center SC, as shown in Fig. 9. However, this is not limiting, and the intensity of the excitation light within a predetermined range from the irradiation center SC in the irradiation region SP may be constant, and the intensity of the excitation light may decrease from the outer edge of the predetermined range toward the outside. In addition, in each of the above embodiments, the peak portion where the intensity of the excitation light is greatest in the irradiation region SP is located at the irradiation center SC. However, this is not limiting, and the peak portion may be located at a location other than the irradiation center SC in the irradiation region SP.

[0083] In each of the above embodiments, with respect to the integrated light amount of excitation light irradiated on the phosphor 52 per rotation of the support substrate 53, the integrated light amount of excitation light irradiated on the rotation center RC is assumed to be less than the integrated light amount of excitation light irradiated on one portion on the locus C3 of the irradiation center SC of the phosphor 52. In other words, the integrated light amount of excitation light irradiated on the rotation center RC during one rotation of the support substrate 53 is assumed to be less than the integrated light amount of excitation light irradiated on one portion on the locus C3 during one rotation of the support substrate 53. However, this is not limiting, and for example, as long as the phosphor 52 can tolerate it, the integrated light amount of excitation light irradiated on the rotation center RC during one rotation of the support substrate 53 may be the same as or greater than the integrated light amount of excitation light irradiated on one portion on the locus C3 during one rotation of the support substrate 53.

[0084] In each of the above embodiments, the circular locus C3 described by the irradiation center SC when the support substrate 53 makes one rotation is positioned more outer with respect to the rotation center RC than the circular locus C2 described by the first part PT1 on the opposite side of the irradiation center SC with respect to the outer edge of the locus C1 of the irradiation region SP when the support substrate 53 makes one rotation. However, the present invention is not limited to this, and the locus C3 may coincide with the locus C2 or may be positioned more inner than the locus C2, for example, as long as the phosphor 52 allows it.

[0085] In the above embodiments, the wavelength converters 5A, 5B, and 5C are provided with the heat dissipation fins 55 provided on the support substrate 53. However, the present invention is not limited to this, and the heat dissipation fins 55 may be omitted. In the first embodiment, the wavelength converters 5A and 5B include air blower fins 584 provided on the connecting member 58A, and in the second embodiment, the wavelength converter 5C includes air blower fins 593 provided on the air blower member 59. However, this is not limiting, and the air blower fins 584 and 593 may be omitted. If the air blower fins 593 are omitted, the air blower member 59 may also be omitted. In this case, the connecting member 58C may be connected to the support substrate 53.

[0086] In the above-described embodiments, the shape of the phosphor 52 is rectangular or circular when viewed from the excitation light incident side. However, the shape of the phosphor 52 is not limited to this, and may be other shapes. For example, the shape of the phosphor 52 may be elliptical or a polygonal shape other than rectangular. In addition, the center of the phosphor 52 as viewed from the excitation light incident side is set to coincide with the rotation center RC. However, this is not limiting, and the center of the phosphor 52 and the rotation center RC as viewed from the excitation light incident side may be offset from each other.

[0087] In each of the above embodiments, the support substrate 53 has the recess 531 provided on the first surface 53A, and the phosphor 52 is disposed in the recess 531. However, this is not limiting, and the support substrate 53 does not necessarily have to have the recess 531. In this case, the phosphor 52 may be adhesively fixed to the first surface 53A. Furthermore, the method for fixing the phosphor 52 to the support substrate 53 is not limited to using an adhesive, and the phosphor 52 may be fixed to the support substrate 53 by other means.

[0088] In each of the above embodiments, the thermal conductivity of the connecting members 58A and 58C is lower than the thermal conductivity of the support substrate 53. However, this is not limiting, and the thermal conductivity of the connecting members 58A and 58C may be equal to or higher than the thermal conductivity of the support substrate 53.

[0089] In each of the above embodiments, the light source device 3 includes the first condenser element 37 that guides the excitation light emitted from the light source 32 to the phosphor 52, and the first condenser element 37 has at least one lens. However, the present disclosure is not limited to this, and depending on the configuration of the light source device, the light source device may not include a lens that guides the excitation light to the phosphor 52.

[0090] In each of the above embodiments, the projector is described as including the three light modulation elements 243R, 243G, and 243B. However, the present disclosure is not limited to this, and the present disclosure is also applicable to projectors including two or fewer or four or more light modulation elements. In each of the above embodiments, the image projection device 2 is described as having the layout of the optical components shown in FIG. 1. However, the present disclosure is not limited to this, and the optical components and layout included in the image projection device 2 are not limited to the above.

[0091] In each of the above embodiments, as the light modulation element 243, a transmissive liquid crystal panel in which the light incident surface and the light exit surface are different is exemplified. However, the present disclosure is not limited to this, and the light modulation element employed in the projector of the present disclosure may have a configuration of a reflective liquid crystal panel in which the light incident surface and the light exit surface are the same. Further, any light modulation device capable of modulating an incident light beam to form an image according to image information, such as a device using a micromirror, for example, a device using a DMD (Digital Micromirror Device) or the like, may be applied to the projector as a light modulation element other than liquid crystal.

[0092] In each of the above embodiments, examples in which the wavelength conversion devices 5A, 5B, and 5C are applied to the light source device 3 and an example in which the light source device 3 including the wavelength conversion devices 5A, 5B, and 5C is applied to a projector are shown. However, the present disclosure is not limited to this, and the wavelength conversion device of the present disclosure may be used in an electronic device other than the light source device, and the light source device of the present disclosure may be used in an electronic device other than the projector, for example, an electronic device such as a lighting device.

[0093] [Summary of the Present Disclosure] The summary of the present disclosure is appended below. [Appendix 1] A phosphor irradiated with excitation light, A support substrate on which the phosphor is disposed, And a driving device for rotating the support substrate, The center of rotation of the support substrate and the irradiation center, which is the center of the irradiation region of the excitation light in the phosphor, are displaced from each other, The irradiation region of the excitation light includes the center of rotation, The phosphor is disposed at a position including the locus of the irradiation region of the excitation light on the support substrate to be rotated, A wavelength conversion device characterized by the above.

[0094] According to such a configuration, by rotating the support substrate by the driving device, the irradiation region of the excitation light can be moved around the center of rotation of the support substrate. Thereby, since the irradiation region of the excitation light in the phosphor is dispersed, the temperature rise of the phosphor due to the irradiation of the excitation light can be suppressed. Therefore, deterioration of the phosphor can be suppressed, and a decrease in the light emission efficiency of the phosphor can be suppressed. Furthermore, since the irradiation region of the excitation light includes the center of rotation of the support substrate, while dispersing the irradiation region of the excitation light in the phosphor, the size of the phosphor including the locus of the irradiation region of the excitation light during rotation of the support substrate can be reduced. Therefore, the support substrate that supports the phosphor can be made smaller, and thus the wavelength conversion device can be miniaturized.

[0095] [Appendix 2] In the wavelength conversion device according to Appendix 1, In the integrated light amount of the excitation light irradiated to the phosphor per rotation of the support substrate, the integrated light amount of the excitation light irradiated to the center of rotation is less than the integrated light amount of the excitation light irradiated to one portion on the locus of the irradiation center in the phosphor, A wavelength conversion device characterized by the above. According to such a configuration, it is possible to suppress the temperature rise of the portion corresponding to the center of rotation where the excitation light always enters the phosphor during rotation of the support substrate. Therefore, deterioration of the phosphor can be suppressed.

[0096] [Appendix 3] In the wavelength conversion device according to Appendix 1 or Appendix 2, When the support substrate makes one rotation, the circular locus described by the irradiation center is located outside the rotation center with respect to the circular locus described by the portion on the opposite side across the irradiation center from the outer edge of the locus of the irradiation region when the support substrate makes one rotation. A wavelength conversion device characterized by this. Generally, in the irradiation light amount of the excitation light in the irradiation region, the irradiation light amount at the irradiation center is the highest, and the irradiation light amount at the outer edge portion of the irradiation region is the lowest. Here, when the circular locus described by the irradiation center is located closer to the rotation center side than the circular locus described by the portion on the opposite side, the locus of the irradiation region when the support substrate makes one rotation can be made smaller, and the phosphor can be made smaller. However, in such a case, the excitation light of the portion where the irradiation light amount is relatively large in the irradiation region continues to enter the region inside the circular locus described by the irradiation center. In this case, it becomes difficult to sufficiently disperse the region where the phosphor is irradiated with the excitation light, and the temperature rise of the region of the phosphor corresponding to the rotation center tends to increase. On the other hand, according to the above configuration, the overlapping area between the region inside the locus described by the irradiation center when the support substrate makes one rotation and the region inside the locus described by the portion on the opposite side when the support substrate makes one rotation can be reduced. At this time, since the excitation light of the outer edge portion where the irradiation light amount is relatively low in the irradiation region is irradiated to the region inside the locus described by the portion on the opposite side, the temperature rise in the inner region can be suppressed. Therefore, it becomes easier to disperse the region irradiated with the excitation light, and the temperature rise of the region of the phosphor corresponding to the rotation center can be suppressed.

[0097] [Appendix 4] In the wavelength conversion device according to any one of Appendices 1 to 3, It includes heat dissipation fins provided on the second surface of the support substrate opposite to the first surface on which the phosphor is disposed. A wavelength conversion device characterized by this. With this configuration, the heat dissipation fins can easily dissipate the heat transferred from the phosphor to the support substrate, thereby improving the heat dissipation effect of the heat transferred from the phosphor.

[0098] [Appendix 5] 5. The wavelength converter according to claim 1, a blower fin provided at a position facing the support substrate in a direction along the rotation axis of the drive device, the blower fin rotating together with the support substrate to circulate an air current through the support substrate; A wavelength conversion device characterized by: With this configuration, the airflow can be circulated through the support substrate by the air blower fins that rotate together with the support substrate, and also through the drive device, thereby improving the cooling efficiency of both the support substrate and the drive device.

[0099] [Appendix 6] 6. The wavelength converter according to claim 1, The outer shape of the phosphor is a circle that includes a circular locus of a circle that is drawn by the irradiation area when the support substrate makes one rotation, when viewed from the incident side of the excitation light to the phosphor. A wavelength conversion device characterized by: According to such a configuration, the area of the phosphor that is not irradiated with the excitation light can be reduced, so that the phosphor can be made smaller, and therefore the wavelength conversion device can be made smaller.

[0100] [Appendix 7] 6. The wavelength converter according to claim 1, The outer shape of the phosphor is a rectangle that includes a circular locus that is drawn by the irradiation area when the support substrate rotates once, when viewed from the incident side of the excitation light to the phosphor. A wavelength conversion device characterized by: Here, some phosphors are cut from a disk-shaped phosphor master and used. By forming such phosphors into the rectangular shape, productivity of the phosphors can be increased, and ultimately, the manufacturing cost of the wavelength conversion device can be reduced.

[0101] [Appendix 8] 8. The wavelength converter according to claim 1, the support substrate has a recess in which the phosphor is placed, The phosphor is an incident surface of the phosphor onto which the excitation light is incident; a first side surface opposite to the incident surface; a second side surface connecting the incident surface and the first side surface, the phosphor is fixed to the recess by an adhesive at the first side surface and the second side surface. A wavelength conversion device characterized by: With this configuration, even if centrifugal force acts on the phosphor when the support substrate rotates, the inner surface of the recess can serve as a receiving surface for the centrifugal force acting on the phosphor when the support substrate rotates, thereby preventing the phosphor from peeling off from the support substrate and ensuring stable placement of the phosphor on the support substrate. Furthermore, the inner surface of the recess can be used as a reflective surface that reflects the light emitted from the phosphor. This allows the exit surface of the phosphor, which emits the light out of the recess, to be defined as the incident surface. This makes it easier to extract light from the phosphor.

[0102] [Appendix 9] 9. The wavelength converter according to claim 1, The drive device is a connecting member connected to the support substrate; a motor that rotates the connecting member to rotate the support substrate, The thermal conductivity of the connecting member is lower than the thermal conductivity of the support substrate. A wavelength conversion device characterized by: According to such a configuration, since the thermal conductivity of the connecting member is lower than that of the support substrate, heat of the phosphor can be suppressed from being transmitted from the support substrate to the motor via the connecting member. Therefore, deterioration of the apparatus main body due to heat can be suppressed.

[0103] [Appendix 10] a phosphor irradiated with excitation light, a support substrate on which the phosphor is disposed, and a driving device that rotates the support substrate, a peak portion where the intensity of the excitation light is maximum in the irradiation region of the excitation light is offset from the rotation center of the support substrate, the irradiation region of the excitation light includes the rotation center, the phosphor is disposed at a position including a locus of the irradiation region of the excitation light on the support substrate that is rotated, A wavelength conversion device characterized by the above.

[0104] According to such a configuration, since the peak portion is offset from the rotation center of the support substrate, when the support substrate is rotated by the driving device, the irradiation region of the excitation light can be moved around the rotation center of the support substrate. Thereby, since the region where the excitation light is irradiated on the phosphor is dispersed, an increase in the temperature of the phosphor can be suppressed. Therefore, deterioration of the phosphor can be suppressed, and a decrease in the light emission efficiency of the phosphor can be suppressed. Furthermore, since the irradiation region of the excitation light includes the rotation center of the support substrate, while dispersing the irradiation region of the excitation light in the phosphor, the size of the phosphor including the locus of the irradiation region of the excitation light during rotation of the support substrate can be reduced. Therefore, the support substrate that supports the phosphor can be reduced, and thus the wavelength conversion device can be miniaturized.

[0105] [Appendix 11] In the wavelength conversion device according to Appendix 10, in the integrated light amount of the excitation light irradiated on the phosphor per rotation of the support substrate, the integrated light amount of the excitation light irradiated on the rotation center is less than the integrated light amount of the excitation light irradiated on one portion on the locus of the peak portion in the phosphor. A wavelength conversion device characterized by the following. According to such a configuration, similar to the wavelength conversion device described above, it is possible to suppress the temperature rise of the portion of the excitation light corresponding to the rotation center where the excitation light always enters the support substrate when the support substrate rotates. Therefore, deterioration of the phosphor can be suppressed.

[0106] [Appendix 12] In the wavelength conversion device according to Appendix 10 or Appendix 11, The circular locus described by the center of the irradiation region when the support substrate makes one rotation is located outside the rotation center with respect to the circular locus described by the portion on the opposite side of the outer edge of the locus of the irradiation region when the support substrate makes one rotation, sandwiching the peak portion. A wavelength conversion device characterized by the following. As described above, in the irradiation light amount of the excitation light in the irradiation region, the irradiation light amount at the irradiation center is the highest, and the irradiation light amount at the outer edge portion of the irradiation region is the lowest. Here, when the circular locus described by the irradiation center is located closer to the rotation center side than the circular locus described by the portion on the opposite side, the locus of the irradiation region when the support substrate makes one rotation can be made smaller, and the phosphor can be made smaller. However, in such a case, in the region inside the circular locus described by the peak portion, the excitation light of the portion where the irradiation light amount is relatively large in the irradiation region continues to enter. In this case, it becomes difficult to sufficiently disperse the region where the phosphor is irradiated with the excitation light, and the temperature rise of the region of the phosphor corresponding to the rotation center tends to increase. On the other hand, according to the above configuration, it is possible to reduce the overlapping area between the region inside the locus described by the peak portion when the support substrate makes one rotation and the region inside the locus described by the portion on the opposite side when the support substrate makes one rotation. At this time, since the excitation light of the outer edge portion where the irradiation light amount is the lowest in the irradiation region is irradiated to the region inside the locus described by the portion on the opposite side, the temperature rise in the inner region can be suppressed. Therefore, it becomes easy to disperse the region irradiated with the excitation light, and the temperature rise of the region of the phosphor corresponding to the rotation center can be suppressed.

[0107] [Appendix 13] A light source that emits excitation light, The wavelength conversion device according to any one of Appendices 1 to 12, And a lens that guides the excitation light to the phosphor. A light source device characterized by this. According to such a configuration, the same effects as those of the above-described wavelength conversion device can be achieved. Therefore, a small light source device that can stably emit light can be configured.

[0108] [Appendix 14] In the light source device according to Appendix 13, The intensity of the excitation light incident on the phosphor is highest at the center of the irradiation region of the excitation light and decreases as it goes toward the outside of the irradiation region of the excitation light. A light source device characterized by this. According to such a configuration, the integrated light amount of the excitation light incident on the inside with respect to the circular locus drawn by the portion on the opposite side across the irradiation center with respect to the outer edge of the locus of the irradiation region when the support substrate makes one rotation can be reduced. For this reason, the temperature rise of the region of the phosphor corresponding to the region inside with respect to the circular locus drawn by the portion on the opposite side can be suppressed. Therefore, the deterioration of the phosphor can be further suppressed, and a light source device that can more stably emit light can be configured.

[0109] [Appendix 15] The light source device according to Appendix 13 or Appendix 14, An image forming device that modulates the light emitted from the light source device to form image light, And a projection optical device that projects the formed image light. A projector characterized by this. According to such a configuration, the same effects as those of the above light source device can be achieved. Therefore, a projector that can stably project image light can be configured, and the projector can be miniaturized.

Explanation of Signs

[0110] 1... Projector, 24... Image forming apparatus, 26... Projection optical device, 3... Light source device, 32... Light source, 37... First condenser element, 371, 372, 373... Lenses, 5A, 5B, 5C... Wavelength conversion device, 51... Fluorescent rotator, 52... Phosphor, 52A... Incident surface, 52B... First side surface, 52C... Second side surface, 53... Support substrate, 531... Concave portion, 532... Engaging portion, 533... Hole portion, 53A... First surface, 53B... Second surface, 54... Reflective portion, 55... Heat dissipation fins, 551... Fins, 56A, 56C... Driving device, 57... Motor, 571... Motor body, 572... Hub, 58A, 58C... Connecting member, 581... First surface, 582... Second surface, 583... Insertion portion, 584... Air blowing fins, 5841... Fins, 59... Air blowing member, 591... Ring-shaped portion, 592... Through hole, 593... Air blowing fins, C1, C2, C3... Loci, SC... Irradiation center, SP... Irradiation region, RC... Rotation center, Rx... Rotation axis.

Claims

1. A phosphor irradiated with excitation light, a support substrate on which the phosphor is disposed, and a driving device for rotating the support substrate, wherein the center of rotation of the support substrate and the irradiation center, which is the center of the irradiation region of the excitation light on the phosphor, are offset from each other, the irradiation region of the excitation light includes the center of rotation, and the phosphor is disposed at a position including the locus of the irradiation region of the excitation light on the support substrate that is rotated. A wavelength conversion device characterized by the above.

2. In the wavelength conversion device according to Claim 1, in the integrated light amount of the excitation light irradiated on the phosphor per one rotation of the support substrate, the integrated light amount of the excitation light irradiated on the center of rotation is less than the integrated light amount of the excitation light irradiated on one portion on the locus of the irradiation center on the phosphor. A wavelength conversion device characterized by the above.

3. In the wavelength conversion device according to Claim 1 or Claim 2, the circular locus described by the irradiation center when the support substrate rotates once is located outside the center of rotation with respect to the circular locus described by the portion on the opposite side of the irradiation center across the irradiation center with respect to the outer edge of the locus of the irradiation region when the support substrate rotates once. A wavelength conversion device characterized by the above.

4. In the wavelength conversion device according to Claim 1 or Claim 2, it includes heat dissipation fins provided on a second surface opposite to the first surface on which the phosphor is disposed on the support substrate. A wavelength conversion device characterized by the above.

5. In the wavelength conversion device according to Claim 1 or Claim 2, it includes air blowing fins provided at a position facing the support substrate in a direction along the rotation axis of the driving device, and rotating together with the support substrate to allow an air flow to circulate through the support substrate. A wavelength conversion device characterized by the above.

6. In the wavelength conversion device according to Claim 1 or Claim 2, the outer shape of the phosphor is circular including the circular locus described by the irradiation region when the support substrate rotates once as viewed from the incident side of the excitation light with respect to the phosphor. A wavelength conversion device characterized by the above.

7. In the wavelength conversion device according to Claim 1 or Claim 2, the outer shape of the phosphor is rectangular including the circular locus described by the irradiation region when the support substrate rotates once as viewed from the incident side of the excitation light with respect to the phosphor. A wavelength conversion device characterized by the above.

8. In the wavelength conversion device according to Claim 1 or Claim 2, The support substrate has a recess in which the phosphor is disposed. The phosphor has an incident surface on which the excitation light is incident in the phosphor, a first side surface opposite to the incident surface, and a second side surface connecting the incident surface and the first side surface. The phosphor is fixed to the recess by an adhesive at the first side surface and the second side surface. A wavelength conversion device characterized by the above.

9. In the wavelength conversion device according to claim 1 or claim 2, the driving device has a connecting member connected to the support substrate, and a motor that rotates the connecting member to rotate the support substrate. The thermal conductivity of the connecting member is smaller than the thermal conductivity of the support substrate. A wavelength conversion device characterized by the above.

10. A phosphor irradiated with excitation light, a support substrate on which the phosphor is disposed, and a driving device that rotates the support substrate, wherein a peak portion where the intensity of the excitation light is maximum in the irradiation region of the excitation light is deviated from the rotation center of the support substrate, the irradiation region of the excitation light includes the rotation center, and the phosphor is disposed at a position including a locus of the irradiation region of the excitation light on the support substrate that is rotated. A wavelength conversion device characterized by the above.

11. In the wavelength conversion device according to claim 10, in the integrated light amount of the excitation light irradiated to the phosphor per one rotation of the support substrate, the integrated light amount of the excitation light irradiated to the rotation center is less than the integrated light amount of the excitation light irradiated to one portion on the locus of the peak portion in the phosphor. A wavelength conversion device characterized by the above.

12. In the wavelength conversion device according to claim 10 or claim 11, a circular locus drawn by the center of the irradiation region when the support substrate rotates once is located outside the rotation center with respect to a circular locus drawn by a portion on the opposite side of the peak portion with respect to the outer edge of the locus of the irradiation region when the support substrate rotates once. A wavelength conversion device characterized by the above.

13. A light source that emits excitation light, the wavelength conversion device according to claim 1 or claim 10, and a lens that guides the excitation light to the phosphor. A light source device characterized by the above.

14. In the light source device according to claim 13, the intensity of the excitation light incident on the phosphor is highest at the center of the irradiation region of the excitation light and decreases as it goes toward the outside of the irradiation region of the excitation light. A light source device characterized by the above.

15. The light source device according to claim 13, an image forming device that modulates the light emitted from the light source device to form image light, and a projection optical device that projects the formed image light, comprising: A projector characterized by the above.

Images